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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e991eb2daab41ada926c1174f8c06c91e7a4711ece097fc87020238012e65c59' 
  AND token = 'ICJaV0d3/07A/LPvGeXG28SMzA3ndPRWUowg2hIyIfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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