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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5afce8964b8e4db6efa8163c0444e0a160640194a10603a94d72c808e47f12f' 
  AND token = '8R5djMuZwQt1gXAaqkJ63l6gzu2oJ0KIcP6i8iN1L+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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