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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6e891e6b11b9fe5d35260b0793e271432c48ecce4fa443c64ca11b7f8801a9' 
  AND token = 'Tnaw0SMI/NmpIfxK7IOiQW99MTnZsKzco2yLiAPZnls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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