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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74987899ea6a6ae7c15d87ebc1ae8b36f8fc08522195ad69c535638debcd1177' 
  AND token = 'ZaeF7n3BN6qb+/PqvBHcvXd5kb4Bry+D/Rijs+toggc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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