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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc302396b57480586adb5307469a370ba007523d34a4fc10347b421b98e5d560' 
  AND token = 'Se1TQN8f+gN9wWbJ1aHLMsC+EUZLrlFbcbzden1pu4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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