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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384c2433750d427d5036364c5e7aa0a440bc1991b626d6d30bbb46bb2de81851' 
  AND token = 'Hd5+Y2hpNuWbxN5+rdwzegu24EexrYHnAnymrYHpMlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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