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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0312ca47e0da8b7e3885c99b78bf7dc4e7b51e3ec0b9b3e00f95084d91fb6bb' 
  AND token = 'rR4temeCcsN8B00VfdF+qSjIS+FUY9NpoTISVEg/4AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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