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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98baccbe71ce5053cbf5f6f85203d592b83640fba3b1fa8ef80e35f7f1a30f8' 
  AND token = 'D+dDpox07PAI6Ol9qJ+d35ZdUYAJ4yD3V+3tfZYI+mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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