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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc949e0618ad6c712229aedf156280c8e933212913772c639d99b6f20882e3bb' 
  AND token = '5Rw3iIumwQOGF46sZ2YvhviAfGR6wMgJSmIg69jtGnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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