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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc80ea2c4b545a9f6470d4ddf537d1bc43fcfaf89e09ce3a4e7e4e46e6a07c4' 
  AND token = '1OmUCRsBE/gL7KB7hLOD7SO9kdXBfJjPsOZSRPdS6TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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