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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da86340d2e65ab163156fcb37beaea23e61e7b6c64cb8737509f2ff7dac5ee0c' 
  AND token = 'zjTGzwI3tKHYPl0UnODrc8EgzRu3movqSpK7OKda9as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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