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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f330dce630b0bd4d5bb596255e5fb8a541c72691b3e29d51b7be0e72c6ee7f6e' 
  AND token = 'gKyvXMZnm2zb6YUontyEAORNWqWIOPq+zt1YkGpCvPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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