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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2520314f8c831fee40c7c896dae472b66110b7a4ad1afe13b2e7c53854248c2' 
  AND token = 'wFJ+PiGypQZDOEaRwyjLYEBw+NBOO9ISipeA7PuIfpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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