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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0992a8793a926c0675c6250f4e71252968b340d2e5d2d6ef27c919a00ecac1' 
  AND token = '7piPdnAUn1Sr7Mk3F1AVKfkkqsn//bEyNL8B9W3OvTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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