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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94b5625768e74eaa06350d0df3865c30af6025d537db378216b5651d28d93c0' 
  AND token = 'aMMcks2bi43B1E0LeNSeV7Mbz58oVKj2BdhKbdd0uW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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