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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436d774686a53b81cffeb4293cf4ce2dcd2be74a514ac665bc639c484860e306' 
  AND token = 'arWT3K1hyVV9k6xeKWlM+2oO/8v1pCTpT/IDHlFEzDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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