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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a0d883c869829a53a739f67e62448553f86e076fe14cda032dbbf3a9d94cc8' 
  AND token = 'B70Rx5TBins0FqCDe4TaY9Ex3YhzwSNWpRtlrwXc4II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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