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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '755a19fd9e0e2ed5fbf08b4458a71e76a693011189f359c70903badca79cbc84' 
  AND token = 'jEOwr0BFI/h6r1b0XlyaEn6JTEaFDnFzX5fdjbAgG6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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