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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca3e63cb460edb0cedaf59301790901d11e3dfb6cf36e2ed2c3ed8d9086ad8' 
  AND token = '/LTnmJhHtWM50M7+d/6OBbu9Z3IrT9X35Gf86LCVbMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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