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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebd9eacfc73e575fc20ae2fd77a2b69472bb2bbc8f61ff1ace6adf9db05832f' 
  AND token = 'Zl2Ewwg+SqIwuWD4etkwcS2d8QN0u1EsNM0OsgDn+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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