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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bd2652b055bda9a9bf180feac9806b69dd37c4068651a1b6fac0f5feb6145d' 
  AND token = 'bmnm6hzonffUmhwg1SF0Fhnh4P78J5Ke9S0GwSaEaWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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