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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35779c53abaeb07ad7e2464a9a7f17e3be246193858b2cfd02c6b13c92175ff8' 
  AND token = 'w47puU8cNQYCwV3R07kqfAEkPMJXsp7UbYJ72bq/N+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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