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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2f4cca5eccfd8b3ca6dac10d73932911c51b6d492693bc2e5f1490ae86a223' 
  AND token = 'AxGSd5pgEHeLL6NABmgAFjCT/bzGGZG7c3zeWAIYcDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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