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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eef3075f61201bac5d2c9a2e4df7ed282e7258b8d148fd4afbc490d293d8d34' 
  AND token = '3osFQc1uhF2gfJHzsMbsyUhhe99WSvTdo/XF954gGtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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