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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2a60e62960cc3fd6161763b70c931b2ebbc303dd93532176173c88b236bc27' 
  AND token = 'hylppP0Sg6lkpd9kbeDC4YfWgkoaaVToD73GqpAI7SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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