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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aaf6d228f4cfe5a8054925fd8d404ee1e67ecdb715e413de869bf7738557602' 
  AND token = '5y4KLYfm6mzIk8dFXB+aav6jDemyrf5+gpBa47e8axY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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