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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef83be6540b874f768b1da01505dae0341a835be67c418488ad616625841a62a' 
  AND token = 'dk/eviiwupNGj5mFL6jbzHcU7reqRjiALznnTE+3IFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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