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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a7778ed263d39fa4a0cebf16b9fb4a2d5d859ece523808b2dda41e8fffbdc3' 
  AND token = 'hqoXdr7djOB6VHO09U84h/a1t9uDGfdo1ARv1ZjlQfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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