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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9267d8a613598a06913cb58f497c83746c95c6ea83971e56e47a723a986fd2' 
  AND token = 'F+Yd3biqPggWeCKWuQ8CgoGbMC86UH7id487UvVGChA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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