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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765956e4451fa7541c941f10433d8308e516a51ddeac632135d9828b7dc6a3c0' 
  AND token = 'THKmHS+EL5hYf8xd0Hm95Xk1To7JKHAQRgeX26GVSqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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