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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cef5524d65a5ef39aec614c151bd738475b1eea8973dfa48b0d838e62b74a1' 
  AND token = 'jEBVa/uyliSqgLgV+PVm/eBy43LBBkeDZGhUc/1urCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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