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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdea716ad436a3d9867eb000c3a481b5c5688873483c318d90f31112f867b11b' 
  AND token = 'le+SKAvRkG0jJz3pVl0GIixiW2kNrAorbXSzboDRv+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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