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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b79bd1bb740ba6e8c9ef336ad72e23d9d18c3b12dc5590bf66e9a5b2085d07' 
  AND token = 'WaBSs5DsO90YjN3r6yKIYIn2ziLpARYi+Pb/nZk0E3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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