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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c967fb2d2e0306712666f9148a0a52f07c3a0cc71b3a6c0b39728aee9a54b2' 
  AND token = 'YvPtm3YmtliTDUm7Be2TJ5nEVLFhGyk0FUdXqNGsqfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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