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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3266ef21ae5ea610c87da88462f39a29a3a3f6af2453f1c20a170691259af3e8' 
  AND token = 'Y6Gffl2N7d1rJXCJ52GlJ1VfcTDP8k5FyskP/9q/URA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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