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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '443a59948252291411261b52c0a02b17a8accbb966fae657d39438ad3988e605' 
  AND token = 'eyQz60EE4J+FqjGEKt1urTpl6/7VG/8Zgr4sdOA/l/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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