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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c93f30084645e07bc5a9c109b2f90f8efc47a0a9fdca129be1cabbdb8f854c' 
  AND token = 'wvjfd5SCZpy2bXmQxXXG1zncxTE2614La2GfAefjnWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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