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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ffaf0806b93ecc0aaf7c526a1391efe64fb5dcff789a1b2e2f5782bedd799c' 
  AND token = 'gpxxtkJEbY60Fr5QhIKj7DZt4kLBkBciILQB72mv410=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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