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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69fe72802b102a310a3e58bf9399ab6de2b7e419de7bcae50b46792e3f458b1' 
  AND token = 'Ny7KQDxnjrXIT0axQQVCRZVl+2XIbg/41NSs70dvyqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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