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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b536319f2c5c59d64bee2ee3125dbc39fb2762d73198a97789733856463841' 
  AND token = 'wuYCdtuW3K7O2AztOOejJ2vBkKSAL+3RLKF5XoRcPMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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