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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a2c3460bf9ec7684db575750ebca7f36a885ebf80cff21a9f834ca564c549f6' 
  AND token = 'Bc4G9t/liqPm6W0VVChpqe5aB3S5ZuNkx4ZCsgRStmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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