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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e32dcfcc8fef5358defa920b3def888f62af080fcabce44f2912fc1788a431' 
  AND token = '2T2TPuS2n5tEI3gZEJ7uraQ7AINyAummIZZpDDGK7no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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