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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd402d4d473175d0df6d839fc82dc3ae360354b763819c4fced9ec229ce4e6a04' 
  AND token = 'SmJeot+dzlCRANgHT+kKV0K1bL0kSIEpqWEm9F94BiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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