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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ba3ed7a8dcd318d7da1e4aa6d6e0e903fafb1df353058fb45928e9d36fe1d7' 
  AND token = 'WLZNwgtlpMy6cej+vWxoWS2RhUY05QfbdfebuD7C8Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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