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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d862729449a9cc0c7b6fb2bfcd31b118abf6cf8961c10b7d5a9b5221bdbc20c' 
  AND token = 'o8f/SYdJEKcEVsABuzkS7HMsFveHjG5Bd4htkJ2P1vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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