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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c4d5b3838132da7e06d79884c5377b8d0c99d0156c0a62f40014621b4090bd' 
  AND token = '0BhiZD0Vij3ioTBWa14/XN7qwxb9xbizo9qZqRdM9BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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