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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd516ac251bc35dc8852a88708425c194dba08cbfd80bfaf5f89d205a14362c' 
  AND token = 'jUQdV3QZW5IOC4zf0NMnftCNCCJ2Am3kuAjH7dgO5hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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