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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec4c0f3fcb7107a2bd5f9211c6c2b85648791a0c1cb5de73999991f8a90bf43' 
  AND token = 'SYyt5pmCCH/6IUb488Q6R3808iIyqpNUhEpdQn0KyEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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