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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269c8fe2dc606cb79424a043463f49db5bee47077c584daf4784c1e7f58de7d2' 
  AND token = 'K6j8NAauYoRidEWToJmfBcMZh2rAQfFIIojoXpnRF6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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