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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e13305a9ca4cf01e56951668736a07b4820ea27916891138a9bc5f4eaa9c09' 
  AND token = 'gyj/4+KSMRE5WjfOuNdVgte7Un/ix5X7sXAnvAcf508=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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