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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb0b23a339fa137ce0ae1b519eff69e953ffb0acbc9498c12365665b7098857f' 
  AND token = 'os8/WlIunE8SLG8GHcHPyN0bL5pSegl8g6vwYBlzq8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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