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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f310d0bb0078e10fdb61a80075f67bea7e3fd5e6a084828001f556e938742703' 
  AND token = 'TuIH9YUafKQaCMDbASiZwAmKU/Pl3Q0UBIEDpbZCfo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}