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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7476c0dd943312d0657bc8822a6bc53f814d89bd0f786f5f52a83f3155c49a' 
  AND token = 'mRNqYldEd3Rb1zpYRDdhW7Z2hVArLjQuyh0t8bVTi5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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