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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5bea36ec37ffbd23c28dba29919d319a465642e041f0bc692dac42555f6aee7' 
  AND token = 'Qx+ybzYXQIT0RUxNOa+MzebWHeUztIFNGW/LmYyH9wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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