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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e3e437243aaeea9d7b955794fe66ce4b03d8a17b3c6eb966b57e7c784bb070' 
  AND token = 'u2PHu+4gdOAKoGruaq2C7fm3LhzaXdc5p+4Kp8fiHgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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