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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11307b03225090c7bb2890e71db3057600614f80cff3c5b01c8a0ea4ad28aae' 
  AND token = 'gzwE++A3iRXTtmYSV/E3fVL+v2vrkm8cz+PVj68oS4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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