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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3148d27f846028d6932acbfd20c4a78b8b75c8ef0980a452977c94ab6cd4591d' 
  AND token = 'mAFaAAapNCn9ZUURO9UKi9/5PkkTZefFtGqmd+SDbCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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