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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed907001f79343e98eae5cab4f15727b3821b9bd7e04fce722cbdba27bd5edf' 
  AND token = 'p1jMNvl3i6XgRco80aLS3+BC8DU05p2gr3ZQ2KCZ+s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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