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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15b05b55803954e7d5256138c4952d1a5fffec7bce5c09e3fb9b1bb73e8e034' 
  AND token = 'Y18QhwzkSdDBsR1kmip2ZRLcAEi8yjWWb8uE3044w6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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