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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d30e085fdad209b190c4c9b5720b22e19c5f09a24d7d7547fb22b2083caa7fa' 
  AND token = 'kYXfWQXcGwGsBPkvrG+Pw/BcO+LS09i5FPcD3cRHlLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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