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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2f484a48237336e7c0c0f00d9b957e3420ea6033e197ead2c52fc953e99c22' 
  AND token = 'FR4cROaee45KNGd78R3UP5KzHugA+728Xfqw/VcnrDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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