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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc232646d51e2d679f7295b938a116edb0564b1381a7550b2c6ea454b73643d' 
  AND token = '+xs/tnX3Y+IUUwnn3BtIUNFSrmcUKsxoynrGMuNuQQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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