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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac972c79677aba97d740a02d584c448ec4f6e9497038c2fdb3fc748ee650526d' 
  AND token = 'qE9gp988YUbiy62BJHSygTFAFjfcLmnL5U50R7aIhrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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