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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04eb832583fffe6d4ab5b69236809f7699a079b008bce5183725b13c2cfa8b9' 
  AND token = 'HBGpBHa03qlE9lI7M7Teki+JAQQX0l6bqEhc+sDI2+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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