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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2903f813e27345695c50bfa488916a6668ad1a9b45eb2d2b950f11c2f79274e' 
  AND token = 'IZa6LoUci/dsyKux8QuOMS+DpWDuu9OUj1D0eIzZTMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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