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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d82a33f7de341f378dd366508db7db5790cde48d31b280e93001c745d68633' 
  AND token = 'kpsXb0DFt4wAe7LbMvBKINIQUIUD0siu5osbVMCDmMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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