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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '329b362ab58bf7a01b7472873394de1b7f13530fed325870c43148b23fbcfc76' 
  AND token = 'Ts+mSWhJLGcpLyFIu3XQoA0wJAAfTeNpMdy9paXircc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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